[dmd]

There's a bunch of Set solvers online (like http://www.stevenolte.com/set/set.html ) for when you get really stuck.

Also, http://3e.org/set/ is great for practice.

[baddox]

Is brute force the only way to solve the game? I only glanced over the rules so I'm not sure, but it seems like a solution would involve finding subgraph isomorphisms (which is NP-complete) or something along those lines.